I agree with @aggi, the Lansky system is pretty good. It's still possible to bugger a knife up, especially with the coarse stones (which you tend to have to use more if you have a seriously ruined edge) but once you get used to it you can quickly get a good edge and maintain it.
I put an unncessary secondary bevel on a bushcraft knife the first time I used it, but since then I've been slowly bringing it back to a Scandinavian grind.
The limitation of the system is that you have a specific range of angles you can use, and obviously your knife might currently be ground somewhere in between the available options. You do have a bit of adjustment as you can choose to press the guide rod against the top or the bottom of the chosen angle slot. A version with an infinitely adjustable slot and ruled guide would be amazing (runs to patent office).
I agree with @aggi, the Lansky system is pretty good. It's still possible to bugger a knife up, especially with the coarse stones (which you tend to have to use more if you have a seriously ruined edge) but once you get used to it you can quickly get a good edge and maintain it.
I put an unncessary secondary bevel on a bushcraft knife the first time I used it, but since then I've been slowly bringing it back to a Scandinavian grind.
The limitation of the system is that you have a specific range of angles you can use, and obviously your knife might currently be ground somewhere in between the available options. You do have a bit of adjustment as you can choose to press the guide rod against the top or the bottom of the chosen angle slot. A version with an infinitely adjustable slot and ruled guide would be amazing (runs to patent office).